Messages in this thread Patch in this message | | | Date | Tue, 1 Jun 2004 18:26:36 -0700 | From | William Lee Irwin III <> | Subject | [2/2] fix io_getevents() timer expiry setting |
| |
On Tue, Jun 01, 2004 at 06:24:29PM -0700, William Lee Irwin III wrote: > The time conversion functions may have const args, which is in fact > useful for when they are passed const variables as arguments so as > to avoid discarding qualifiers from pointer types warnings. This is > a preparatory cleanup for a minor aio bugfix.
start_jiffies was not respected by set_timeout(), which reread jiffies instead of respecting what read_events() passed it. This difference can be significant, particularly if the calling process slept during the copy_to_user() operation in read_events(). To correct this, this patch teaches it to respect its argument, with the additional bonus of converting it to use timespec_to_jiffies() instead of open-coding it.
Index: timer-2.6.7-rc2/fs/aio.c =================================================================== --- timer-2.6.7-rc2.orig/fs/aio.c 2004-06-01 03:25:53.000000000 -0700 +++ timer-2.6.7-rc2/fs/aio.c 2004-06-01 16:03:41.000000000 -0700 @@ -777,19 +777,11 @@ static inline void set_timeout(long start_jiffies, struct timeout *to, const struct timespec *ts) { - unsigned long how_long; - - if (ts->tv_sec < 0 || (!ts->tv_sec && !ts->tv_nsec)) { + to->timer.expires = start_jiffies + timespec_to_jiffies(ts); + if (time_after(to->timer.expires, jiffies)) + add_timer(&to->timer); + else to->timed_out = 1; - return; - } - - how_long = ts->tv_sec * HZ; -#define HZ_NS (1000000000 / HZ) - how_long += (ts->tv_nsec + HZ_NS - 1) / HZ_NS; - - to->timer.expires = jiffies + how_long; - add_timer(&to->timer); } static inline void clear_timeout(struct timeout *to) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |